Abstract: A semiconductor device includes a processor for running a real-time operating system (RTOS). The RTOS causes the processor to update internal time during a first mode and to stop updating in a second mode. A first counter periodically transmits an interrupt signal to the processor that is coordinated with a periodic counting sequence. A second counter counts while the semiconductor device is in the second mode. A first circuit reads a first count value from the first counter at a starting time of a transition from the first to the second mode, masks the interrupt signal, and causes the second counter to start counting. A second circuit unmasks the interrupt signal from the first counter after a starting time of a transition from the second to the first mode and reads a second count value from the second counter.

Abstract: A semiconductor device includes a processor for running a real-time operating system (RTOS). The RTOS causes the processor to update internal time during a first mode and to stop updating in a second mode. A first counter periodically transmits an interrupt signal to the processor that is coordinated with a periodic counting sequence. A second counter counts while the semiconductor device is in the second mode. A first circuit reads a first count value from the first counter at a starting time of a transition from the first to the second mode, masks the interrupt signal, and causes the second counter to start counting. A second circuit unmasks the interrupt signal from the first counter after a starting time of a transition from the second to the first mode and reads a second count value from the second counter.

Abstract: According to one embodiment, a development system includes an instruction set simulator (ISS) and a checker. The ISS includes a central processing unit (CPU) model that simulates an execution program and a memory model as a work area of the processor model. The checker monitors execution of an access instruction, included in the execution program, on the memory model and, when a difference between a data length at the time of writing and a data length at the time of reading on the same spot is detected, notifies an execution spot at the time of detection as an endian dependent spot.